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(No Model.) 3 Sheets-Sheet 1.

E. R. KNOWLES &'E. H. PARK.

ELECTRIC ARC LAMP.

No. 516,825. Patented Mar. 20, 1894.

3 Sheets-Sheet 2.

Patented Mar. 20, 1894.

m H r (NCModeL) E. R. KNOWLES 82; E. H. PARK. ELECTRIC ARC LAMP WMWAQC:

(No Model.) I 3 Sheets-Sheet 3. E. R. KNOWLES & E. H. PARK. ELECTRIC ARC LAMP No. 516,825. Patented Mar. 20, 1894.

UNITED STATES PATENT OFFICE.

EDlVARD R. KNOWLES, OF MIDDLETOIVN, CONNECTICUT, AND EDWIN H. PARK, OF MILBURY, MASSACHUSETTS, ASSIGNORS TO THE SCHUYLER ELECTRIC COMPANY, OF CONNECTICUT.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 516,825, dated March 20, 1894.

Application filed May 25,1893- Serial No. 475,490. (No model.)

To aZZ whom it may concern:

Be it known that we, EDWARD R. KNowLEs, residing at Middletown, in the county of Mid dlesex and State of Connecticut, and EDWIN H. PARK, residing at Milbury, in the county of lVorcester and State of Massachusetts, citizens of the United States, have invented certain new and useful Improvements in Horizontal Electric Lamps; and we do hereby declare the following to be a full, clear, and en act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Our invention relates to electric lights, and its object is to improve the focusing arc lamps used in projectors or search lights. It is desirable in such apparatus not to obstruct the rays of light reflected from the mirror. In some types of lamp, the carbons and carbon holders are placed in an upright position, and hence intercept a considerable portion of the reflected light.

In our invention, the carbons are arrange horizontally, and the supports are slender, so that the obstruction is reduced to a minimum. We also dispense with the ratchet wheel and pawl in the feeding mechanism, and substitute therefor a friction clutch, which is capable of feeding the carbons by very small advances. Provision is also made for a quick adjustment of the carbons by hand when desired.

Other details of construction will be more particularly described hereinafter.

In the drawings, Figure 1 is a side elevation. Fig. 2 is a top plan View, partlybroken away. Fig. 3 is a View of the left-hand end of Fig. 1. Fig. 4 is an end view of the positive carbon holder, Figs. 5, 6, 7 and 8 are details, and Fig. 9 is a diagram of the circuits and connections.

On a suitable bed plate A are erected posts B which support a top-plate C parallel with the bed-plate A. Running between and parallel with these plates are two parallel rods iD, firmly fastened at each end and in the middle to solid frames D, attached to the bed-plate. These rods serve as ways upon which the carbon holders E, F slide, by means of cross-heads c, f, mounted on the rods. The positive carbon holder E consists of two legs rising from the crosshead 6 through longitudinal slots in the top-plate C, and uniting in a head c. A small bracket e projects laterally from one leg near the head 6. Resting on the head is a horizontal worm gear Gr, pivoted on a vertical shaft H, journaled in the head. In the bracket 6 is mounted a short worm shaft G meshing with the worm gear; and having a handle g, by which it may be turned. Rising from one edge of the gear is an arm g on which is hinged on the transverse pin 9 a rocker I carrying a segment worm gear 11, which meshes with a worm hon the upper end of the shaft H, the lower end of which carries a hand-wheel 71. Two jaws l are hinged to each side of the rocker on longitudinal pintles 2", and a clamping bolt 2' passes transversely through said jaws, having a thumb-nut The negative carbon holder F has a single leg, to the upper end of which are hinged the clamping jaws F, which are similar to the jaws I. The edges of the slots in the topplate, through which the legs of the carbon holders pass, are provided with upturned flanges c, and each leg carries a long cover 0', provided with downwardly turned flanges fitting over the flanges c.

For the purpose of moving the carbon holders in order to feed the carbons, each crosshead 6, f, carries a nut, which meshes with a screw-shaft made in two parts K, K, and running parallel with the rods D. The thread of one portion of the shaft is right-hand, while that of the other portion is left-hand, and the pitch of the portion, which feeds the positive carbon is sharper than that which feeds the negative carbon, as is usual. The

abutting ends of the shaft portions are squared, and are received in a coupling K journaled in a stationarybearing d in the intermediate frame D. The part K is capable of axial movement in the coupling, to which it is splined by the pin and slots shown in ion Z on an'upright shaft L, extending down" below the bed-plate A, and provided with a hand-wheel Z, by means of which motion can be imparted to the shafts K, K, when a quick adjustment of the carbon holders is desired. A still more rapid adjustment can be made by disengaging the screws from the crossheads e, f, the threads on which are made in the form of half-nuts m carried by levers M, hinged to the cross-heads and retained in mesh with the screws K, K, by means of springs m. When a'lever M is lifted thehalf-nut is disengaged from the screw, and the cross-head is left free to be slid by hand along the rods D to any desired point.

The automatic feeding of the carbons is effected by a friction clutch operating to turn the shaft L, and actuatedby the electro-magnet'N, in shunt to the carbons. A flat, cupshaped disk 0 is secured to the shaft L, Within which is a ring P,'thicker on one side than on the other, and cut in two by a diagonal cut across its thickestportion. A lever Pis fulcrumed'at p on one side of the cut, and

pivoted at p" on the other side of the cut, its

outer endbeing connected by a link 9 with" the armature N of the shunt magnet N. Whenthis-armature is attracted, the cut ring is-slightly-rotated in the cupped disk,

and at the same time is expanded in diameterby the action of the lever,-onits fulcrump and pivot pin 19''. This'expansion causes the ring to pressagainst the inside of the disk with sufli-cient friction to compel the disk to move with it, and thus the shaft'L is given a partial rotation,.with" the hands of a watch in Fig 2. On the back stroke of the armature,thelever tends to contract the ring and the disk is'not turned. An adjustable stop P limits the backward movement of the lever. In this way the screws are rotated step by step, and the carbons'are fed toward each'other, so long as the armature of the shunt magnet vibrates.

In the shunt-circuit'is a circuitcontroller, comprising two abutting contact pins Q, pref-- erablysupported in a bracket, fastened to the bedplate.=-0ne pin is adjustable by means of a screw q. The other pin is free to move longitudinally, and carries an adjustable stop q; A finger n on the armature of the shunt magnet plays between thisstop and another, g on the same pin. When the mag-- net isenergized, the armature is attracted,

and when near the end of its stroke the finger n' engages the stop q, and separates the contact pins, thereby breaking the circuit,

and-permitting the spring n' to .pull the ar mature away from the magnet.- When near the end of its back stroke, the armature hits the stopg and throws the pins into contact again; This make and break action is con-- tinned-until the carbons have been fed together, "when the striking magnet R becomes energized and the arc is formed.

The armature R. of the striking magnet is hinged upon the bed-plate,-and carries afork 0, which engages a groove in a collar is secured to the screw K. When the magnet is energized, the armature is attracted, and

gives an axial movement to the screw K,

which draws the carbon holder F away from the holder E, and thus strikes the arc. The movement is not enough to disengage the screw K from the coupling K so that the feeding action of the screw K is not affected. The are is partially surrounded by the seg' mental hoop S of soft, iron, which becomes magnetized by the current and exerts an attractive force upon the arc, to maintain it steadily in the same position. At one end of the bed-plate is a transverse latch T to engage with a groove-in a screw shaft U working in a nut u fixed to the frame on-which the lamp is supported and-enabling the entire lamp to be nicely adjusted to the focus of the mirror.

The cross-heads e, f, are connected respectively by means of'jointed arms V with lugs W secured upon the bed-plate, and connected with strips X which "constitute the lamp terminals. The projector drum, or other holder for the lamp is provided with contacts to en-' gage with the strips X when the lamp is slid into place.

In a projector, the top-plate O is flush with with its supports 8.; The position of the arc 'is readily adjust'able by means ofthe handwheel h, and handleg', which enablerthe tip of'the positive carbon to be moved-in an-ydirection; The hoop S is alsoadjustable by means of the slotted plates S, to which its supports 3 are fastened by' the screws 8' 1 Having thus described our invention, what we claim is 1. In a horizontalarc lamp, the combination with a bed-plate, of*contact strips fastened thereto, ways'supported thereon, carbonholders sliding on said ways, and jointed'arms connecting said carbon holders with said strips, substantially asdesc'ribed; l

2. In ahorizontal arclamp,'thecombination with 'a bed-plate, of lugs secured thereto, two parallel rods supported'thereon, cross-heads sliding on said rods and carrying carbon holders, j ointed-arms connecting said cross heads with said lugs, contact stripsincon' nectionwith said lugs,and means for moving said cross he'ads, substantially as described. I

3. In a'horizontal arc lamp, the combination with two movable carbon holders, of two screws abutting end to end and of opposite pitch, a coupling'receiviug said abutting ends, a stationary bearing in which-said cou'pling is journaled, a gear wheel on one ofsaid' screws, a pin in the other screw engaging with longitudinal grooves in said coupling, a grooved collar on saidscrew, and an arc striking magnet having its armature engaging with said grooved collar, substantially as described.

4. In a horizontal arc lamp, the combination with a horizontal bed plate, of uprights thereon, two parallel rods supported horizontally on said uprights, crossheads sliding on said rods and carrying carbon holders, a right and left hand screw shaft running parallel with said rods, levers hinged to said cross heads and containing half nuts meshing with said screws, and springs for keeping said half nuts in mesh, substantially as described.

5. In a horizontal arc lamp, the combination with a bed plate, of movable carbon holders, feed screws and are striking mechanism, mounted above said bed plate, and feed driving mechanism suspended below said bed plate so as to be easily accessible, substantially as described.

6. In a horizontal arc lamp, a carbon holder comprising a horizontally turning wheel, a rocker hinged to said wheel on a horizontal axis, and clamping jaws carried by said rocker, substantially as described.

7. In a horizontal arc lamp, a carbon holder comprising a horizontal worm wheel, a worm shaft engaging therewith, an arm projecting from said wheel, a rocker hinged to said arm, clamping jaws carried by said rocker, and means for tilting the rocker on its hinge, substantially as described.

8. The combination with the carbon holder E, of the horizontal worm wheel G mounted thereon, the worm shaft G in mesh with said wheel, the vertical worm shaft H, the rocker I, hinged to the wheel G and having a segment worm gear in mesh with the worm on the shaft H, and clamping jaws, carried by said rocker, substantially as described.

9. In a horizontal arc lamp, the combination with a plate having slots, of movable carbon holders passing through said slots, and covore for said slots fastened to the carbon holders, substantially as described.

10. In a horizontal arc lamp, the combination with the top-plate 0, having slots, and upturned flanges 0 along the edges of said slots, of movable carbon holders passing through said slots, and carrying plate 0' having downwardly turned flanges fitting over the flanges a, substantially as described.

11. In an arc lamp, the combination with the shunt magnet, of a circuit controller comprising two abutting contact pins, one of which is axially movable, and a finger on the shunt magnet armature adapted to engage with said movable pin, substantially as described.

12. In an arc lamp, the combination with the shunt magnet, of a circuit controller comprising two abutting contact pins, one of which is axially movable, two stops on said movable pins, and a finger on the shunt magnet armature to engage with said stops, substantially as described.

13. In an arc lamp, the combination with the magnet N, of the armature N having a finger n, and the two abutting contact pins Q, one of which has the adjustable stop q, and the fixed stop (1 between which the finger it plays, substantially as described.

In testimony whereof we affix our signatures in presence of witnesses.

EDWARD R. KNOWLES. EDWIN H. PARK.

Witnesses as to the signature of Edward R. Knowles:

DANIEL J. GLAZIER, J 0s. ELLIOTT. lVitnesses as to the signature of Edwin H. Park:

N. H. PARK, HENRY O. PEASE. 

